40. Piston and Connecting Rod Assemble

Piston and Connecting Rod Assemble (L9H and L94)





Note: 2010 Model Year: RPO's L9H and L94 have 1st and 2nd design piston and ring assemblies. If piston and/or ring assemblies are being replaced, design level must be identified for proper replacement.

1. 1st design pistons have a cast dimple (1) on top of the piston 14.5 mm (a) inboard from outside edge.
2. 2nd design pistons have a cast dimple (2) on top of the piston 5.5 mm (b) inboard from outside edge.




3. Install the retainer. The retainer should be seated in the groove of the pin bore.




4. The mark (1) on the top of the piston and the large set of tabs (2) on the side of the connecting rod should be facing the same direction.




5. Install the piston pin to the piston and connecting rod.
6. Install the retainers. The retainers should be seated in the groove of the pin bore.





Note: When installing piston rings, use a ring expander plier type tool. Do not roll the rings into the grooves of the piston. Use caution and care to expand the rings only slightly larger than the outside diameter (OD) of the piston.

7. Using piston ring pliers, install the piston rings onto the piston. The top compression ring has a shinier finish than the lower compression ring. The dimple or mark on the piston ring should face the top of the piston. If no dimple or mark can be found on the top compression ring, it may be installed in either direction.
8. Position the oil control ring end gaps 180 degrees opposite each other.
9. Position the compression ring end gaps 180 degrees opposite each other.




10. Install the connecting rod bearings to the rod and cap.